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Can anyone tell me the size of the four bolts that secure the engine mount insulators on a 351 Cleveland? These are the bolts that thread into the block. I need diameter, length and thread pitch. Thanks.
 

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7/16 14 tpi (NC)?....5/8" hex head.....Can't help with length for sure but, if similar to W and 289/302, 1" or 1.25" should be fine, depending on whether lockwasher is used.

As long as thread engagement is equal to or greater than the major diameter of the threads, the fastener will achieve full clamping capacity. I use grade 8 fasteners in these locations on the race car. Engine plates secure the engine in the chassis but I use anti-blow-back struts which mount in the stock engine mount location.
 
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